Plessey MDR2400-SR, Руководство пользователя

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MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10
Page 14
2 Technical Description
2.1 System Overview
A digital radio link (DRL) consists of a pair of MDR / Orion radio stations.
The radio stations consists of two main parts:
•
An Outdoor Unit operating in the 2.4GHz or 5.8 GHz ISM frequency bands. The
Outdoor Unit provides the radio transceiver functionality by accepting radio link
data from the Indoor Unit and converting it to the 2.4GHz or 5.8 GHz ISM
frequency band using spread spectrum or QAM modulation. The received signal
is de-modulated and transmitted to the Indoor Unit in a digital format.
• An Indoor Unit, available with 1, 2, 4 or 8 T1 and 1, 2, 4 or 8 E1 data interfaces
(choice of T1 or E1 is software selectable). The Indoor Unit combines nT1 or nE1
data with Wayside Service Channel serial data and link IP data to be transmitted
across the radio link. The Indoor Unit also provides power to the Outdoor Unit.
Interconnection between Outdoor Unit and Indoor Unit is achieved using low cost data
and power cables.
2.2 Outdoor Unit
The MDR2400 and MDR5800 Outdoor Units make use of Spread Spectrum
modulation technology for license-free operation in the 2.4GHz and 5.8 GHz ISM
bands. The Orion5850 Outdoor unit uses three software selectable bandwidths for
license-free operation in the 5.8 GHz ISM band.
For operation, the ISM bands are divided into upper and lower frequency sub-bands.
A ‘High Band’ Outdoor Unit transmits in the higher frequency sub-band and receives in
the lower frequency sub-band, while a ‘Low Band’ Outdoor Unit transmits in the lower
sub-band and receives in the higher sub-band. An MDR / Orion radio link will use a
‘Low Band’ Outdoor Unit on one end of the link to communicate with a ‘High Band’
Outdoor Unit on the other end.
The Outdoor Units use a Type-N RF output connector for connection to suitable
2.4GHz and 5.8GHz antennas for applications where long range is required.
The system is available for use in FCC regulated countries.
User Data
MDR2400, MDR5800 or
Orion 5850 OU
MDR / Orion IU
User Data
MDR2400, MDR5800 or
Orion 5850 OU
MDR / Orion IU